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https://pokemonblog.com/2020/10/12/master-league-and-its-premier-cup-as-part-of-go-battle-league-season-4-now-underway-in-pokemon-go-until-october-26-at-1-p-m-pdt/
Master League and its Premier Cup as part of GO Battle League Season 4 now underway in Pokémon GO until October 26 at 1 p.m. PDT